Chinua Achebe's short story "Civil Peace" takes place in which historical context?

Chinua Achebe penned "Civil Peace" in 1971, depicting through it the effects of the Nigerian Civil War on a man and his family. The War, which began in 1967 with the secession of several Southeastern provinces from Nigeria, led to an intensive ethnic conflict and wide-spread starvation, destroying national infrastructure and shattering Nigerian society.